.He is really incompetent! The letter ______ yesterday.
a. should be finished typing b. must be finished typing
c.must have finished typing d. should have been finished typing
However, at times this balance in nature is disturbed by human activities, _______ a number of possibly unforeseen effects.
| A．lying in | B．calling in | C．taking in | D．resulting in |
The news that he fought with his coach surprised us, ________?
| A．did he | B．didn’t it | C．didn’t he | D．did it |
It doesn’t matter ________ you take it seriously, for _______ matters is that he can realize it.
| A．whether; that | B．that; what | C．whether; what | D．that; that |
These facts are unimportant in ________, but if you put them together, you may find something unusual.
| A．it | B．them | C．itself | D．themselves |
Mary’s house in Shanghai cost much more than ours in our hometown, though not half______.
| A．much bigger | B．as bigger | C．very big | D．so big |